Does my mom have dementia?

My mother is 68 y/o and is living on her own. She would talk about people using devices to beam in on her legs, she would unplug TV, phones, freezer, fridge, microwave and clock radio. She has knives in all windows, she boards up her doors. She talk off the wall sometimes and she complains about people and lie on people. She is stubborn and self medicates and barely take her important medication. She talks about people or out to steal and get her, even her family members. She wets herself a lot and thinks people are causing it. She sits all day and does not get dress. She fell and did not contact anyone for 12 hours so she is in a skilled nursing facility but will be going home soon with a wheelchair. She refuses help from me and others because she is suspicious of anything. I'm not sure what it is but it's driving me crazy. I can't get her evaluated without her signature so that's tough.